Free mushroom calculators for your website
Growers, bloggers, clubs and suppliers are welcome to put our calculators straight into their own pages. They are free, need no signup, and stay free. Copy a snippet, paste it into your page, done. Grow mushrooms. Not spreadsheets.
What you get
Each snippet below embeds a live, working calculator as a responsive iframe — not a screenshot or a static link. Visitors get the same interactive tool as our own site: they enter their own numbers and see results instantly, without leaving your page or creating an account. It is a genuinely useful addition to a mushroom blog post, club newsletter, workshop handout page or supplier product page, and it is maintained by us, so it keeps working as we improve the maths.
Browse the full set of calculators on /tools, read the background in our growing guides, or see how suppliers get a branded version through our partner programme.
Spawn to Substrate Ratio Calculator
Work out spawn weight for a bulk substrate batch at your chosen ratio.
<iframe src="https://hyphaefidelity.com/embed/spawn-ratio" title="Spawn to Substrate Ratio Calculator — Hyphae Fidelity" width="100%" height="900" style="border:1px solid #d9d5c7;border-radius:12px" loading="lazy"></iframe>Suggested size: full width of your content column (minimum 320px) and 900px tall. On narrow phones, allow up to 1100px so nothing is cut off.
Substrate Hydration Calculator
Mass-balance water calculation for hydrating coir, pellets, straw or soy hulls.
<iframe src="https://hyphaefidelity.com/embed/substrate-hydration" title="Substrate Hydration Calculator — Hyphae Fidelity" width="100%" height="900" style="border:1px solid #d9d5c7;border-radius:12px" loading="lazy"></iframe>Suggested size: full width of your content column (minimum 320px) and 900px tall. On narrow phones, allow up to 1100px so nothing is cut off.
Master's Mix Mushroom Substrate Calculator
Batch maths for 50:50 hardwood and soy hull substrate — per block and per batch.
<iframe src="https://hyphaefidelity.com/embed/masters-mix" title="Master's Mix Mushroom Substrate Calculator — Hyphae Fidelity" width="100%" height="900" style="border:1px solid #d9d5c7;border-radius:12px" loading="lazy"></iframe>Suggested size: full width of your content column (minimum 320px) and 900px tall. On narrow phones, allow up to 1100px so nothing is cut off.
Mushroom Substrate Selector
What should I grow it on? Choose a species and grow style for a sensible substrate starting point.
<iframe src="https://hyphaefidelity.com/embed/substrate-selector" title="Mushroom Substrate Selector — Hyphae Fidelity" width="100%" height="900" style="border:1px solid #d9d5c7;border-radius:12px" loading="lazy"></iframe>Suggested size: full width of your content column (minimum 320px) and 900px tall. On narrow phones, allow up to 1100px so nothing is cut off.
Mushroom Grow Bag Calculator
Scale a hydrated production block recipe across a whole batch of grow bags.
<iframe src="https://hyphaefidelity.com/embed/grow-bag" title="Mushroom Grow Bag Calculator — Hyphae Fidelity" width="100%" height="900" style="border:1px solid #d9d5c7;border-radius:12px" loading="lazy"></iframe>Suggested size: full width of your content column (minimum 320px) and 900px tall. On narrow phones, allow up to 1100px so nothing is cut off.
Biological Efficiency (BE) Calculator
Compare how much fresh mushroom a block returned against the dry substrate that went into it.
<iframe src="https://hyphaefidelity.com/embed/biological-efficiency" title="Biological Efficiency (BE) Calculator — Hyphae Fidelity" width="100%" height="900" style="border:1px solid #d9d5c7;border-radius:12px" loading="lazy"></iframe>Suggested size: full width of your content column (minimum 320px) and 900px tall. On narrow phones, allow up to 1100px so nothing is cut off.
Accessibility and responsiveness
The embeds are keyboard operable and use standard form controls, and they resize to fit the width of your content column — set width="100%" as shown above rather than a fixed pixel width so they work on phones as well as desktop. Keep embeds to one or two per page so they stay a helpful addition rather than clutter.
Attribution and terms
Embedding is free, for any site, commercial or personal. In return we ask that:
- The "Powered by Hyphae Fidelity" link stays visible and clickable, and the embed's results are not modified, relabelled or stripped of that credit.
- No resale, sublicensing or white-labelling without written permission.
- Embedded copies are marked as non-indexable, so they never compete with your own pages or ours in search.
- We may change or improve the calculators; embeds update automatically.
Want a branded version?
Suppliers can have a product-specific calculator and QR grow journey tied to their own kits and substrates.
See the supplier partner programme